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Areoligera semicirculata
Areoligera semicirculata, (Morgenroth, 1966), Stover and Evitt, 1978
NOW Licracysta? Originally Cyclonephelium, subsequently Areoligera, thirdly (and now) Licracysta? Questionable assignment: Fensome et al. (2007. p.408).
Holotype: Morgenroth, 1966, pl.2, fig.33
Paratypes: Morgenroth, 1966
Locus typicus: Itzehoe, Germany
Stratum typicum: Middle Oligocene
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Original description as Cyclonephelium semicirculatum: [Morgenroth 1966, p. 10]: (Translation: LPP):
Diagnosis:
A Cyclonephelium-species with normally semi-circularly arranged massive processes, that widen distally, tapering at their very ends into tiny, whip-shaped, elongated side- branches.
Description:
The thin-walled, finely granulated capsule is dorso- ventrally flattened.
The antapical pole is usually characterized by 2, not equally protruding bulges. The weakly pointed, sometimes rounded apical pole has been split off like a large polar calotte with an irregularly notched edge in almost all specimens.
The processes are almost exclusively restricted to the meridional zone. Only sporadically processes occur on the dorsal or ventral side. The massive processes are placed on semicircular, meridionally arranged areas. Fused at their bases, they slightly widen distally or, at their very ends, split up into 2-5 side-branches, that may be prolonged in a whip-shaped manner. The processes are often perforated by small holes. Their length per individual specimen is almost constant, but in contrast varies strongly among specimens.
Dimensions:
Length 55(45/61) µm, width 51(42/56) µm, height 38(33/40) µm, processes 22(5/33) µm. 100 measurements. 450 specimens studied.
Affinities:
Until now, there is no Cyclonephelium species known whose processes are arranged on semicircular, meridionally arranged areas.
Because of the exclusively meridionally arranged processes, Cyclonephelium semicirculatum cannot be included in Areoligera Lejeune-Carpentier.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Areoligera semicirculata (Morgenroth, 1966b) Stover and Evitt, 1978, commonly has soleate complexes on the dorsal surface and linear complexes on the ventral surface. Distally, the processes expand and their margins are produced into minute flagelliform lateral branches, similar to the endings of Enneadocysta.
Size: central body, length 45-61 µm, width 42-56 µm, height 33-40 µm, processes 5-33 µm.
NOW Licracysta? Originally Cyclonephelium, subsequently Areoligera, thirdly (and now) Licracysta? Questionable assignment: Fensome et al. (2007. p.408).
Holotype: Morgenroth, 1966, pl.2, fig.33
Paratypes: Morgenroth, 1966
Locus typicus: Itzehoe, Germany
Stratum typicum: Middle Oligocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Cyclonephelium semicirculatum: [Morgenroth 1966, p. 10]: (Translation: LPP):
Diagnosis:
A Cyclonephelium-species with normally semi-circularly arranged massive processes, that widen distally, tapering at their very ends into tiny, whip-shaped, elongated side- branches.
Description:
The thin-walled, finely granulated capsule is dorso- ventrally flattened.
The antapical pole is usually characterized by 2, not equally protruding bulges. The weakly pointed, sometimes rounded apical pole has been split off like a large polar calotte with an irregularly notched edge in almost all specimens.
The processes are almost exclusively restricted to the meridional zone. Only sporadically processes occur on the dorsal or ventral side. The massive processes are placed on semicircular, meridionally arranged areas. Fused at their bases, they slightly widen distally or, at their very ends, split up into 2-5 side-branches, that may be prolonged in a whip-shaped manner. The processes are often perforated by small holes. Their length per individual specimen is almost constant, but in contrast varies strongly among specimens.
Dimensions:
Length 55(45/61) µm, width 51(42/56) µm, height 38(33/40) µm, processes 22(5/33) µm. 100 measurements. 450 specimens studied.
Affinities:
Until now, there is no Cyclonephelium species known whose processes are arranged on semicircular, meridionally arranged areas.
Because of the exclusively meridionally arranged processes, Cyclonephelium semicirculatum cannot be included in Areoligera Lejeune-Carpentier.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Areoligera semicirculata (Morgenroth, 1966b) Stover and Evitt, 1978, commonly has soleate complexes on the dorsal surface and linear complexes on the ventral surface. Distally, the processes expand and their margins are produced into minute flagelliform lateral branches, similar to the endings of Enneadocysta.
Size: central body, length 45-61 µm, width 42-56 µm, height 33-40 µm, processes 5-33 µm.